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MgSOo type water with a TDS value of 9710 mg/l. <br />Well GW-S2W-180V exists between the middle and proposed south pit areas. Water quality <br />monitoring at this well was discontinued after the October, 1995 sample was collected. <br />Monitoring was discontinued since it was not downgradient of the current mining area and also <br />because a sampling pump was lost in the well in May, 1994. This well displayed a NaMgCa- <br />HC03 type water with an average TDS value of 652 mg/I (range 180-7981 <br />Wadge Coal. Well GW-S2W-2W was a flowing monitoring well that existed downgradient of <br />the II-W South area. It was part of the triple well completion described in the Wadge <br />overburden section and was also abandoned in 1994. Samples from this well displayed a <br />MgCaNa-HCOa type water with an average TDS value of 559 mg/1 (range 334-616). <br />Well GW-S2W-4W exists in the II-W South area. Monitoring for water quality at this well <br />began in June, 1980 and was discontinued in June, 1985. Monitoring was resumed in July, <br />1997. Samples from this well display aCaMg-HCOa type water with an average TDS value of <br />815 mg/I Irange 292-18861• <br />Well GW-S2W-18W exists between the middle and proposed south pit areas. Water quality <br />sampling was discontinued after the October, 1995 sample was taken. Monitoring was <br />discontinued since it was not downgradient of the current mining area and also because a <br />sampling bailer with steel cable was lost down the well in September, 1991. It displayed a <br />NaMgCa-HCOa type water with an average TDS value of 673 mg/I Irange 614-7841. <br />Sage Creek Overburden. Well WSOV24 was drilled in August 2001. The two samples <br />collected so far display aCaMg - HCO3 type water with TDS values of 660 and 760 mg/1. <br />Sarre Creek Coal. Well WSC24 was drilled in August 2001. The two samples collected so far <br />display a Na-HCO3SOa type water with TDS values of 770 and 1190 mg/I. <br />Wolf Creek Overburden. Well WWCOV24 was drilled in August 2001. The two samples so far <br />display aCaMg-HCOa type water with TDS values of 550 and 720 mgll. <br />Wolf Creek Coal. Two wells monitor this unit. Well GW-S24-4WC was first sampled in 7983, <br />discontinued in 1985, and reestablished in 7997. It displays a MgCa-HC0sS0a type water with <br />an average TDS value of 812 mg/I (range 254 - 78701. <br />Well WWC24 was drilled in August 2001. The two samples collected so far display a Na-HC03 <br />type water with TDS values of 640 and 820 mgll. <br />148 Revised 01/02 <br />